6 ms·
Bad Apple but it's 6,500 regexes that I search for in Vim
- perpetualchange 2y agoRoughly how long did that take?
- jchw 2y agoFrom the article: > I didn’t have the time to find a good general-purpose algorithm: I was working on this the night before weekly presentations at the Recurse Center and I wanted to present it the next day! ... > I built this in a single day No estimate of hours, though.
- perpetualchange 2y agoMy browser was apparently bugged, and it didn't show the article the first time... I see it now and am going through it. Thanks for mentioning! :)
- eieio 2y agoHi! I'm the author. Like jchw said, this was a single-day project (although I did the writeup for it the next day). I went from 0-prototype in one sitting; I think that was around four or five hours of work? Then I went home, had dinner, and spent maybe three hours optimizing and cleaning it up. edit: I should say, i have done a lot of dumb things like this and I'm pretty sure it would have been at least a week of work for me 2 years ago. "making the computer do dumb stuff" is a skill like any other!
- perpetualchange 2y agoThanks for taking the time to respond, pretty impressive stuff!
- panzi 2y agoDoing that in a single day is impressive. Took me two days to do my much simpler version that just prints it using Unicode symbols for legacy computing.
- summeroflove20 2y ago[dead]
- GZGavinZhao 2y ago... this is why we love bad apple!
- yeahbutonly 2y ago[flagged]
- sltkr 2y agoFor the rectangle minimization problem: your problem seems to differ from the one discussed on StackOverflow in that the SO thread discusses partitioning into non-overlapping rectangles, while your Vim project allows overlap. I wouldn't be surprised if your problem turns out to be much easier to solve optimally.
- eieio 2y agooh this is a really good point! You're totally right, I had completely skipped over the fact that the rectangles were allowed to overlap. I think I'm probably done with this project / I'm pretty happy with the solution as it stands, but I think you're right that this simplifies the problem considerably. Thanks!
- vidarh 2y agoI think my attempt would've been to flood fill to create an ordered list of spans, then use roughly the same method as the Lebesque integral, using the data from the flood fill as the function.
- rav 2y agoActually, from an algorithmic standpoint it's the opposite: the minimum cover problem (where overlap is allowed) is NP-hard whereas the minimum partition problem (where overlap is NOT allowed) has polynomial-time algorithms. "An Algorithm for Covering Polygons with Rectangles" by Franzblau and Kleitman 1984: https://core.ac.uk/download/pdf/82333912.pdf https://core.ac.uk/download/pdf/82333912.pdf However, that's of course just an academic tangent - the theoretical results don't necessarily imply that one problem is easier than the other when you're just getting something to work for an afternoon project.
- wistle 2y ago[flagged]
- saagarjha 2y agoSeems better than using a literal Playboy centerfold.
- wistle 2y agoBoth are objectionable.
- saagarjha 2y agoOk, but one of them is literal pornography, and one is…clearly you actually know what the word "hentai" is given you have used it in your comment. What part of this is hentai?
- wistle 2y ago[flagged]
- CuriousCosmic 2y agoIt's not though? It's a music video for a 100% safe for work video game where small sprites of witches and yokai (supernatural entities/spirits) play what is in effect a much more complicated version of space invaders. There is nothing even remotely close to sexual or NSFW in it. https://www.youtube.com/watch?v=AY7QEEnSGVU https://www.youtube.com/watch?v=AY7QEEnSGVU
- sososocontext 2y ago[flagged]
- codeguro 2y agoTouhou is just a bullet hell game, relax. Being this upset over it is more a reflection where your mind is at rather than everyone else's.
- rav 2y agoRegarding the Vim macro that ends by going to the next line to be "replayable": You can also use the following command to run the macro once per line: :%norm @q
- eieio 2y agooh wow, TIL, I'm pretty surprised I didn't know this trick! back when I was vim golfing the normal solution was to make the macro recursive. So you'd record your macro, and you'd end it with '+@q' (move to next line and run the macro again). Then you run the macro once and it runs over every line. This ends up being really efficient in terms of keystrokes but in practice I think it's hard to think about and not very ergonomic, so I don't end up using it much. But it's a fun trick for golfing.
- rav 2y agoThere's also the no-macro solution where you just use ":%norm [series of keystrokes]" to run the given keystrokes on each line, but that comes with the added difficulty of not giving any visual feedback of what the keystrokes will do before you submit the entire line. One thing to keep in mind is that ":%norm" will place the cursor at the start of each line, before any indentation, whereas the trick of ending the macro with "+" will place the cursor at the start of each line after the indentation. But this can be worked around with ":%norm ^@q", using ^ to skip indentation before running macro q on each line.
- Izkata 2y agoRelated to that, macros are just recorded into normal registers. You can get it out with: "qp Edit it, and put it back into the register with "qdd
- rav 2y agoHeads up - you should use "qD instead of "qdd to avoid an extra newline at the end of the register contents. (In fact the current Vim 9.1.954 behavior seems a bit odd in that it moves the cursor down, but not to the start of the line, as if j is pressed... Seems like a bug to me.)
- adityaathalye 2y agoHah, trust nolen to 1,000x something :))) I have used similar tactics in the past, but separately and definitely not in one day! For the interested: - Bad Matrix (tput blocks to the terminal): https://www.evalapply.org/posts/bad-matrix/ https://www.evalapply.org/posts/bad-matrix/ - Animating Text Art in Javascript (print text into fixed grid, flipbook-style): https://www.evalapply.org/posts/animate-text-art-javascript/index.html#setinterval-and-settimeout-worked-just-right https://www.evalapply.org/posts/animate-text-art-javascript/... - oxo (format and print tic-tac-toe board to terminal, so I can regex-match for win/loss/draw results): https://github.com/adityaathalye/oxo/blob/7681e75edaeec5aa1fe63bc510af1f5dbd9c74c0/oxo_logic.sh#L176 https://github.com/adityaathalye/oxo/blob/7681e75edaeec5aa1f... But, I mean, that Bad Apple takes the cake! (edit: add missing link)
- DiggyJohnson 2y agoAhaha `oxo` is an unhinged project to actually execute. Thanks for sharing all of these projects. Brb forking and integrating ascii-text third party ads
- adityaathalye 2y agoThank you for the kind appreciation. ascii-text third party ads adds a whole commercial dimension... Now, to make it really 21st century, someone can replace the "randumb" computer player with an LLM adversary :)
- codeguro 2y agoThis is pretty cool! I like the creativity. The games this is based on are pretty good too. Danmaku are hypnotic
- 29athrowaway 2y agoThe people running Doom or Bad Apple in different unexpected ways are such champs. There are some really interesting ones, like running Doom on a pregnancy test.
- saagarjha 2y agoStrongly disagree on that one; it was basically Doom on some random microcontroller stuffed into a pregnancy test shell.
- jordigh 2y agoThe pregnancy test was the greatest drama to ever hit the r/itrunsdoom community.
- 29athrowaway 2y agoGood point
- PaulHoule 2y agoThese were on sale last month https://us.govee.com/products/govee-curtain-lights https://us.govee.com/products/govee-curtain-lights and my understanding is that you can upload an animated GIF to it... I just added making a "bad apple" GIF for it to my Kanban board though I don't know how much memory the device has and how well I can get it to work. (Sometimes that part where Remmy Scarlet spreads her wings still makes chills go down my spine)
- nokeya 2y agoSomeone definitely need to shoot Bad Apple using a kanban board!
- PaulHoule 2y agoAnother project on my Kanban board is a plan to big spread of Touhou characters linked with QR codes. Here's a prototype card https://bsky.app/profile/up-8.bsky.social/post/3lbqfh7pesc2x https://bsky.app/profile/up-8.bsky.social/post/3lbqfh7pesc2x and the spreads I make are like https://bsky.app/profile/up-8.bsky.social/post/3latxcwmkpk2w https://bsky.app/profile/up-8.bsky.social/post/3latxcwmkpk2w I have a list of 20 that I need to fill out a little (somehow I missed Koakuma) and then I have to have my image sorter find a good set of images that fit together stylistically. (A friend of mine was talking about how RA's in dorms would make picture sets for all the rooms, seemed to me Touhou would be the ultimate basis for this)
- nl 2y agoI have one of these curtain lights and they are great!
- a_t48 2y agoI've done this with Twinkly lights, but the lights sadly don't have enough memory to run more than a few seconds.
- panki27 2y agoI have a GIF of Bad Apple at 64x32, just under 1MB. Big shout out to https://ezgif.com/ https://ezgif.com/ !
- 3eb7988a1663 2y agoThe parallel candidate solution generator is such a good idea, but it usually takes me a long time to realize I do not need to make the uber algorithm. Just one-more-tweak, and I know that I can make this solution work in all cases!
- eieio 2y agoit's probably my single favorite trick for making a prototype performant enough! I'm delighted every time that it works. but agree that it can be really hard to take a step back and realize that you can employ it instead of writing something "perfect"
- jordigh 2y agoThe tech demo that really made me fall in love with Bad Apple was getting it to run on the NES. https://somethingnerdy.com/downloads/ https://somethingnerdy.com/downloads/ Here it is running from my Everdrive. https://inversethought.com/jordi/video/badapple.mp4 https://inversethought.com/jordi/video/badapple.mp4 Yes, with full audio. It's about one gigabyte of data. On a system where the typical game size is no more than a couple hundred kilobytes, and your CPU only has three 8-bit registers for you to do any calculation with.
- junon 2y agoVery cool. Having done a bit of NES dev I can imagine this wasn't super straightforward to make performant for the graphics, given you can typically only have a few sprites on a row before the NES starts to 'dissolve' them (not sure the term). I wonder if it's using the background tile map for this instead of sprites, though that's also an impressive amount of graphics bandwidth. > with full audio playback rate (44.2kHz) The audio being so clear is also impressive, is that something that the card extends? IIRC the PCM channel on the NES isn't anywhere near that bitrate, and is also 8-bit sample size.
- Dylan16807 2y agoThe channel can either play back delta-modulation samples from memory, or you can directly set the output as a 7 bit value. So by burning a lot of CPU cycles, you can keep up a perfectly good sample rate using the latter method.
- godd2 2y agoThe bitrate of the PCM is determined based on how quickly you can write a byte to the register. The fastest you could write general data is once every 6 cycles, which gives ~298 MHz of sample rate, so 44.2 kHz is easily doable if that's all you want to do with the CPU.
- junon 2y agoDo you mean 298 KHz? I thought the 6502 on the NES was slightly over 1MHz
- manosyja 2y agoI remember watching the Soccer World Cup 2006 at work. I logged in my home server via ssh and could watch it in the terminal. Not enough bandwidth for something else.
- lupire 2y agoAs the author admits, it's Vim but it's not regexes. It's "searching" for screen coordinates. It's drawing in Vim, but not pattern matching.
- krick 2y agoI never get tired of Bad Apple. The best thing on the internet. And almost every time I get somewhat jealous I didn't come up with that idea myself. Also, I really like how footnotes are implemented in this blog. I guess I'm gonna steal it.
- eieio 2y agoI stole the footnotes from my very talented friend Jake (https://jakelazaroff.com/ https://jakelazaroff.com/), whose work you might have seen on here in the past. Note that they’re sidenotes on large screens but on small ones they swap to inline footnotes that expand when you click on them. Anyway steal away!!
- laurentpm 2y ago[dead]
- thatxliner 2y agoNah what ads in HN is crazy
- panzi 2y agoThis is amazing! Also made me write my own version for the terminal using legacy symbols for computing: https://youtu.be/lDLFhQTFcTk https://youtu.be/lDLFhQTFcTk Details: https://github.com/panzi/bad-apple-terminal https://github.com/panzi/bad-apple-terminal
- sharyphil 2y agoAwesome. One can never have enough Bad Apples!